Blasting-powder



UNITED STATES PATENT OFFICE.

FRANS GUSTAF ABEL BROBERG, OF EMPORIUM, PENNSYLVANIA, ASSI GNOR F ONE-HALF TO DAVID LUNDY WILDRIQK, OF DOVER, JERSEY.

BLASTlNG-POWDER.

srncmrcs'rron forming part of Letters Patent No. 542,728, ems m "16, iees'.

Anrllcation filed September 11,1894.

To all whom it maygoncern:

Be it known that I, FRANs GUSTAF ABEL- BROBERG, a subject of the Kingof Sweden and Norway, (but having declared my intention of I becoming a citizen of the United States,) residing at Emporium, in the county of Cameron and State of Pennsylvania, have invented certain new and useful Improvements in Blasting-Powder; and I do hereby declare the foliowingto he a full, clear, and exact description of the invention, such as will enable others skilled in the art towhichit appertains to makeand use-the same.

My invention relates to improvements in blasting-powder; and it consists, essentially,

in preparing an intimate mixture of resin,

nitrate of soda and sulfur, so as to form a substitute for ordinary black powder.

-In practice the ingredients are. mixed to-' co gether in or about the following proportions, by weight: Rosin, five or six per cent; sulfur, eighteen to twenty per cent, and nitrate of soda, seventy-four to seventy-seven per cent. In manufacturing the powder I preferably :5 grind the nitrate of soda exceedingly fine, and after melting the rosin and the sulfur togather and stirring well I incorporate most thoroughly the nitrate of soda and then granulate.

The rosin not only furnishes carbon and hydrogen to the mixture, but it also servesas a protective varnish to the nitrate of soda, and to a large degree prevents the saine from deliquescing,

. The mixture is exploded by miuating-cap.

The mixture is found, in practice, to be very effective for blasting purposes.

The proportions of the ingredients may be 0 varied at will, according to the character of the explosive to be manufactured.

I am aware that dynamite has been made means of a l'Iul-' Serial Ra 522,149. (lie specimens.)

of nitrate of soda, resin, and nitroglycerin, to which sulfur has also been added. I am also aware that an'explosive has been made consisting of nitrate of soda, sulfur, resin and wood-tar.- Both of these compounds differ from mine both in the ingredients used and in the character of. the finished explosive in that my-explosive, is a free-running powder, which the other compositions are not. Itis evident that tar or any other liquid orviscousingredient could not be added to my explosive without detriment to the same.

It is evident that the nitrate of be replacedby its wellknown chemical soda may equivalentsnitrate of potash,n itrat-e 0! barium, &c. t

Having thus described my, inventiomwhat I claim, and desire to secure by Letters Patent of the United States; is'- .1. In the art of making explosives, the improvementwhichconsists in melting sulphur and resin and adding to this mixture, while 7 ins melted state, dry pulverized nitrate of soda, and agitating the'mixture until the particles of nitrate of soda are thoroughly covered with the mixture ofresin and sulphur,

as and for the purposes described. 5

2'. As a new explosive, a free running powder, consisting of 'nitrate of soda, resin, and sulphur, substantially as and in the proportions described.

3; As a new explosive, a free running powder consisting of particles of nitrate of soda coated with a mixture of resin and sulphur, as described.

In testimony whereof .Iaflix my signature in presence of. two witnesses.

, FlhtNS GUSTAE ABEL BROBERG.

' Witnesses:

FRANKLIN HAUSLER, JOHN J. Hnmxnn. 

